---
id: 64646bc0e5a60ea131e03f91
title: الخطوة 80
challengeType: 0
dashedName: step-80
---

# --description--

Before you start writing code for the animation, let's take a look at the function you'll use to add and remove elements from the DOM: `setTimeout`.

The `setTimeout` function takes two arguments: a callback function and a number representing the time in milliseconds to wait before executing the callback function.

For example, if you wanted to log `Hello, world!` to the console after `3` seconds, you would write:

```js
setTimeout(() => {
  console.log("Hello, world!");
}, 3000);
```

Use the `setTimeout` function to add a one second delay before the text `Code` is logged to the console. Then see what happens after you enter `5` into the number input and click the `Convert` button.

# --hints--

Your `showAnimation()` function should contain a call to the `setTimeout` function.

```js
assert.match(code, /setTimeout\(/);
```

You should pass a callback function as the first argument to the `setTimeout` function.

```js
assert.match(code, /setTimeout\(\s*\(\s*\)\s*=>\s*\{?|setTimeout\(\s*function\s*\(\s*\)\s*\{/);
```

Within the callback function, you should log the text `Code` to the console.

```js
assert.match(code, /setTimeout\(\s*\(\s*\)\s*=>\s*\{?\s*console\.log\(\s*('|"|`)\s*Code\s*\1\s*\)|setTimeout\(\s*function\s*\(\s*\)\s*\{\s*console\.log\(\s*('|"|`)\s*Code\s*\2\s*\)/i);
```

You should pass `1000` as the second argument to the `setTimeout` function.

```js
assert.match(code, /console\.log\(\s*('|"|`)\s*Code\s*\1\s*\)\s*;?\s*\}?\s*,\s*1000\s*\)/);
```

# --seed--

## --seed-contents--

```html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Decimal to Binary Converter</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <h1>Decimal to Binary Converter</h1>
    <div class="input-container">
      <label for="number-input">Enter a decimal number:</label>
      <input
        value=""
        type="number"
        name="decimal number input"
        id="number-input"
        class="number-input"
      />
      <button class="convert-btn" id="convert-btn">Convert</button>
    </div>
    <output id="result" for="number-input"></output>
    <div id="animation-container"></div>
    <script src="script.js"></script>
  </body>
</html>
```

```css
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --light-grey: #f5f6f7;
  --dark-blue: #1b1b32;
  --orange: #f1be32;
}

body {
  background-color: var(--dark-blue);
  font-family: "Times New Roman", Times, serif;
  font-size: 18px;
  color: var(--light-grey);
  padding: 0 15px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  text-align: center;
  font-size: 2.3rem;
  margin: 20px 0;
}

.input-container {
  margin: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
  align-items: center;
}

.convert-btn {
  background-color: var(--orange);
  cursor: pointer;
  border: none;
  padding: 4px;
}

.number-input {
  height: 25px;
}

#result {
  margin: 10px 0;
  min-width: 200px;
  width: fit-content;
  min-height: 80px;
  word-break: break-word;
  padding: 15px;
  border: 5px solid var(--orange);
  font-size: 2rem;
  text-align: center;
}

#animation-container {
  margin: auto;
  max-width: 300px;
}

.animation-frame {
  margin: 250px auto 0;
  padding: 15px 10px;
  border: 5px solid var(--orange);
  font-size: 1.2rem;
  text-align: center;
}

@media screen and (min-width: 500px) {
  .input-container {
    flex-direction: row;
  }

  #result {
    max-width: 460px;
  }
}
```

```js
const numberInput = document.getElementById("number-input");
const convertBtn = document.getElementById("convert-btn");
const result = document.getElementById("result");

const decimalToBinary = (input) => {
  if (input === 0 || input === 1) {
    return String(input);
  } else {
    return decimalToBinary(Math.floor(input / 2)) + (input % 2);
  }
};

const showAnimation = () => {
  console.log("free");
--fcc-editable-region--
  console.log("Code");
--fcc-editable-region--
  console.log("Camp");
};

const checkUserInput = () => {
  const inputInt = parseInt(numberInput.value);

  if (!numberInput.value || isNaN(inputInt)) {
    alert("Please provide a decimal number");
    return;
  }

  if (inputInt === 5) {
    showAnimation();
    return;
  }

  result.textContent = decimalToBinary(inputInt);
  numberInput.value = "";
};

convertBtn.addEventListener("click", checkUserInput);

numberInput.addEventListener("keydown", (e) => {
  if (e.key === "Enter") {
    checkUserInput();
  }
});
```
